2A, 2B AND 2C TUNERS (ATU)
Copyright 2013 CCA
Original 2C Tuner in Collins 150C Transmitter
The 2 Series tuners were used with Collins Early Model Transmitters
(See Manual Drawing below for the Figures)
2B comes with 2 RF ammeters – Figure 2 (2b & 2C rated 250 Watts or less)
2C comes with 1 RF ammeter
Figure 1 of Manual Drawing shows 2A & 2C (2A 50 Watts or less)
2A Panel Height is 3.5 in. & 2B & 2C Panel Height is 7 in.
Input tuning knob is always on left – from front.
Manual Drawing for 2 Series ATU
XMTR Model | Introduced | w/ Tuner |
4A | Extra (2A) | |
30W | Jan ’32 | n/a |
150 (Bul 100) | Jun ’32 | 2B/2C |
40B | Oct ’32 | Custom (1 Knob & 1 RF Ammeter) |
150B | Feb ’33 | 2B/2C |
32A & B | Apr ’33 | None Stock or 2A |
300B | Aug ’33 | 2B/2C |
30DXB | Jan/Feb ’34 | 2B/2C |
30FXB | Jun ’34 | 2B/2C |
300B | Oct ’34 | 2B/2C |
30FX | Jun ’34 | 2B/2C |
32F | (Jan ’35) | 2A |
300BA | May ’35 | 2B |
150C | Jun ’35 | 2B/2C |
202-A | Sep ’35 | n/a Enclosed |
45A | Oct ’35 | n/a Extra (2B/2C) |
600A | Dec ’35 | Custom w/ 2 RF Ammeters |
30FXC | Feb ’36 | Later Version 2B w/ 2 RF Amp |
30FXR | Jul ’36 | Later Version 2B w/2 RF Amp |
20C | Aug ’36 | n/a BC Enclosed |
32G | Mar ’37 | n/a None std (2A/2B – f/ 1/2 Ammeters) |
201/202BA | Jun ’37 | Commercial |
250A | Aug ’37 | Commercial |
New 20C | Sep ’37 | n/a BC Enclosed – Later 20C Design |
18J Mob | Oct ’37 | n/a |
30J | Nov ’37 | n/a |
– – – – – – – – CCA – – – – – – –
Note: The images and text used in these pages are copyright 2013 protected, are restored and written by the Collins Collectors Association or its representatives, and may not be used in any other commercial or website applications. They may be downloaded and used privately – not for publication or internet use.
- CCA COLLINS HISTORICAL ARCHIVES
- The Pre War Years
- 150 Series Transmitter
- 2A, 2B AND 2C TUNERS (ATU)
- 30FX Transmitter
- 30FXB Transmitter
- 30FXC Transmitter
- 30FXR Transmitter
- 30J Transmitter
- 30W Transmitter
- 32 A/B Transmitter
- 32F Transmitter
- 32G Transmitter
- 40A/B Transmitter
- 45A Transmitter
- 4A Transmitter
- Bulletin 100
- Bulletin 101
- Bulletin 105
- Bulletin 200
- Bulletin 200A
- The Lost Decade
- The War Years
- Post War Broadcast / Commercial
- The Black Boxes
- The Grey Boxes
- The “S” Word or Solid State